A multi-layer thin film composite comprising a substrate and at least one crystalline dielectric layer of the formula PbZrxTiyOz or PbLbZrxTiyOz wherein L is a lanthanide metal, b is from about 0.02 to about 0.10, x and are independently between from about 0.35 to about 0.65 and z is between from about 2.5 to about 5.0 and wherein the thickness of the dielectric layer is between form about 100 to